The corrosion of Aaron Stone

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Introducing a Memcached Module for Varnish 3

Varnish makes your websites go faster.
Memcached, makes your websites go faster. Blog posts
abound on using Varnish’s excellent embedded C functionality to link
libmemcached into your VCLs, and Poul himself has written about his surprise in
learning that many VCLs were actually thin wrappers around a C library where
all of the business logic of a VCL would live.

Starting in Varnish 3, the balance can now shift back towards the VCL itself as
the driver of business logic, with first-class “vmod” modules providing new VCL
functions. (If you’ve been around a while, you might recognize the same
progression that PHP took in the late 90’s and early 2000’s, back when PHP
looked like a promising future.)

Without further ado, I present
libvmod-memcached, a Varnish
Memcached Module. Here’s a quick example script that flushed the cache for a
page every 20 hits.